<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body,h1,h2,h3,h4,h5,h6,ul,ol,li,p {
            margin: 0;
        }
        ul,ol {
            padding: 0;
            list-style: none;
        }
        a {
            text-decoration: none;
            color: #000;
        }

    </style>
</head>
<body>
    <h1>我是h1</h1>
</body>
</html>